EP 1164693 A2 2001-12-19 - Amplifier apparatus

Title (en)

Title (de)

Title (fr)

Publication

Application

Priority

JP 2000178996 A 20000614

Abstract (en)

An amplifier apparatus including a first dividing circuit (1) disposed at the input side of an amplifier (3), for dividing an input signal into a primary signal to be amplified by the amplifier (3) and an auxiliary signal for distortion detection, a distortion compensating signal generating circuit (10) for generating a distortion compensating signal, based on the auxiliary signal and the output of the amplifier (3), to compensate a distortion component contained in the output of the primary amplifier (3) and inputting the generated signal into the amplifier (3), and a primary signal combining circuit (2) for combining the primary signal obtained by the first dividing circuit 1 with the distortion compensating signal. The result is that even using an auxiliary amplifier whose gain is small or without using such auxiliary amplifier in a feedback system, the distortion component contained in the output of the amplifier (3) can be effectively compensated.